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The diatomaceous earth is used to insulate boilers and steam pipes because

1. The wall of diatoms is deposited with calcium.
2. The diatomaceous earth is cheap.
3. It is a good conductor of heat.
4. The wall of diatoms is made of silica

Correct answer: The wall of diatoms is made of silica

Solution

Diatomaceous earth comes from the fossilized remains of diatoms, whose cell walls are made of silica. Silica is a poor conductor of heat, so the material is useful for insulating boilers and steam pipes.

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